function form_Validator(form)
{

 if (form.realname.value == "")
  {
    alert("Please enter your name.");
    form.realname.focus();
    return (false);
  }
  
   if (form.company.value == "")
  {
    alert("Please enter your company name.");
    form.company.focus();
    return (false);
  }
  
   if (form.telephone.value == "")
  {
    alert("Please enter your phone number.");
    form.telephone.focus();
    return (false);
  }
  
 if (form.email.value == "")
  {
    alert("Please enter your email address.");
    form.email.focus();
    return (false);
  }
  
  return (true);
  }